Question

afla numarul necunoscut .
24+5xa+62= 126
(729+y):2=870
(b-800):50+900=1.000

Answer 1

5a+86=126;5a=126-86
5a=40;a=8

728+y=870×2
728+y=1740
y=1740-728
y=1012

(b-800):50+900=1000
(b-800):50=1000-900
(b-800):50=100
b-800=100×50
b-800=500
b=800+500
b=1300

Answer 2

5xa+24+62=126       (729+y)=870x2            
5xa+86=126               729+y=1740
5xa=126-86                 y=1740-729
5xa=40                        y=1011
a=40:5                         (729+1011):2=870


a=8
24+5x8+62=126